JPS63270918A - Oil impregnated sintered bearing - Google Patents
Oil impregnated sintered bearingInfo
- Publication number
- JPS63270918A JPS63270918A JP31950887A JP31950887A JPS63270918A JP S63270918 A JPS63270918 A JP S63270918A JP 31950887 A JP31950887 A JP 31950887A JP 31950887 A JP31950887 A JP 31950887A JP S63270918 A JPS63270918 A JP S63270918A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- diameter part
- oil
- large diameter
- small diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000005245 sintering Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 230000000754 repressing effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
Landscapes
- Sliding-Contact Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、軸受内径が軸受の両端部分で小さく、軸心
方向中央部で大きい焼結含油軸受に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sintered oil-impregnated bearing in which the inner diameter of the bearing is small at both end portions of the bearing and large at the central portion in the axial direction.
粉末冶金法によって製造されるこの種の含油軸受につい
ての用途および使用方法はいろいろあるが、同じ軸受を
2個並列させて用いる場合がある。There are various applications and usage methods for this type of oil-impregnated bearing manufactured by powder metallurgy, but two of the same bearing may be used in parallel.
第1図に示すコアレスモーフがその例であり、その場合
、2個の含油軸受1.2は巻き線3を支持するモータ軸
4の一端部分を支持するために用いられ、それらの含油
軸受1.2は樹脂製ザボート5に、また樹脂製サポート
5は鉄心6にそれぞれ取り付けられろ。An example is the coreless morph shown in FIG. .2 should be attached to the resin the boat 5, and the resin support 5 should be attached to the iron core 6.
ところで、従来、含油軸受1.2としては軸心方向の断
面形状が一様の単なる円筒形のものが用いられていた。By the way, conventionally, as the oil-impregnated bearing 1.2, a simple cylindrical bearing with a uniform cross-sectional shape in the axial direction has been used.
しかし、それらの位置決めにバラツキを生じることは勿
論のこと、個々の軸受1゜2の大きさにもバラツキがあ
ることから、2個の含油軸受1.2をモータ軸4と偏心
なく取り付けろことは困難であり、それによりノイズや
シャフトかじりなどの問題が避けかたかった。However, it goes without saying that there will be variations in their positioning, and there will also be variations in the size of the individual bearings 1.2, so it is important to install the two oil-impregnated bearings 1.2 without eccentricity to the motor shaft 4. This made it difficult to avoid problems such as noise and shaft galling.
このような問題を解決する考え方として、実開昭47−
8842号公報に記載された焼結含油軸受が知られてい
る。As a way of thinking to solve such problems,
A sintered oil-impregnated bearing described in Japanese Patent No. 8842 is known.
ところが、上記公報記載技術は、軸受内周面の小径部か
ら大径部に至る部分が直角になっているため、シャフト
のたわみなどによってノヤフトかじりの問題は依然とし
て残っているばかりか、小径部から大径部に至る部分が
直角になっていると、その部分で油膜切れを起こしやす
く、焼き付きなどによって長寿命化を図ることができな
いという問題があった。However, in the technology described in the above publication, since the portion of the inner circumferential surface of the bearing from the small diameter portion to the large diameter portion is at right angles, not only does the problem of shaft galling still remain due to shaft deflection, but also If the part leading to the large diameter part is at a right angle, there is a problem in that the oil film tends to run out at that part, and it is impossible to achieve a long life due to seizing or the like.
本発明は、以上のような背景のらとになされたもので、
ソヤフトかじりがなく、また油膜切れを起こすことのな
い焼結含油軸受を提供することを目的としている。The present invention was made against the background as described above.
The purpose of the present invention is to provide a sintered oil-impregnated bearing that is free from soybean galling and oil film depletion.
この発明は全体を焼結材で構成し、軸受内径を軸心方向
両端部分で小さく、軸心方向断面で円弧状に形成しかつ
小径部と大径部との直径差を2μm以上としたらのであ
る。This invention is constructed entirely of sintered material, has a small inner diameter at both end portions in the axial direction, is formed in an arcuate cross section in the axial direction, and has a diameter difference of 2 μm or more between the small diameter portion and the large diameter portion. be.
以下、添付の第2図〜第5図を参照しながら、この発明
の内容について詳細に説明する。Hereinafter, the content of the present invention will be explained in detail with reference to the attached FIGS. 2 to 5.
この発明の焼結含油軸受71.72においては、全体が
焼結材からなり、第2図に示すように、軸受孔81.8
2の軸心方向中央部に軸方向断面で円弧状の逃げ81a
、82aを設けた点に特徴がある。したがって、この発
明の含油軸受7I、72では、軸受の両端部分における
内径d1(小径部)が軸心方向中央部における内径dt
(大径部)よりら小さくなっている。The sintered oil-impregnated bearing 71.72 of the present invention is entirely made of sintered material, and as shown in FIG.
An arc-shaped relief 81a in the axial cross section is provided at the center of the axial center of the
, 82a are provided. Therefore, in the oil-impregnated bearings 7I and 72 of the present invention, the inner diameter d1 (small diameter portion) at both end portions of the bearing is equal to the inner diameter dt at the central portion in the axial direction.
(large diameter part).
この上うな各含油軸受71.72は、たとえば面性した
コアレスモーフにおける軸受1,2に代えて利用される
が(第3図)、これらの各含油軸受71.72はそれぞ
れ全体として一体物であるにもかかわらず、互いに離れ
た両端部分81b、81c;82b、82cがそれぞれ
独立した従来の軸受1゜2と同様の機能を果たすことに
なる。この場合、そのような機能を有効に果たすために
は、da−d。Each of these oil-impregnated bearings 71, 72 is used in place of bearings 1 and 2 in a planar coreless morph, for example (Fig. 3), but each of these oil-impregnated bearings 71, 72 is integral as a whole. Despite this, the two end portions 81b, 81c; 82b, 82c, which are separated from each other, perform the same functions as independent conventional bearings 1.2. In this case, in order to effectively perform such functions, da-d.
≧2μmに設定することが必要である。It is necessary to set the thickness to ≧2 μm.
逆に、dtd+<2μmの場合には半径差で1μmしか
なく、この逃げ81a、82aの部分に十分な潤滑油量
を確保できず、油溜りとしての機能を喪失させてしまい
、軸心方向の断面が一様な単なる円筒状の軸受けと何ら
変わるところがなくなってしまう。On the other hand, when dtd+<2μm, the difference in radius is only 1μm, and it is not possible to secure a sufficient amount of lubricating oil in these reliefs 81a and 82a, which causes them to lose their function as oil reservoirs, and It is no different from a simple cylindrical bearing with a uniform cross section.
したがってdt d1≧2μmの場合には、この逃げ
81a、82aの部分が油溜りとして機能し、軸受の長
寿命化を図ることかできる。Therefore, when dt d1≧2 μm, the relief portions 81a and 82a function as oil reservoirs, making it possible to extend the life of the bearing.
また、逃げ81a、82aを軸心方向断面において円弧
状に形成しているので、小径部d、内周面から大径部d
、の逃げ81a、82aに至る部分Xが鈍角となるため
に、シャフトのたわみなどでXの部であたってシャフト
に傷をつけるということかなく、また小径部d、から大
径部d、に至る内周面のXの部分で油膜が切れず、焼き
付きなどを長期間に亘って防止し、品質の安定性や長寿
命化を図ることができる。さらには、この軸受にシャフ
トを挿入するさいに円弧面がシャフトの先端をなめらか
に案内するので、軸受内周面やシャフトを傷付けない点
で好ましい。なお、各含油軸受71.72の大きさは、
たとえば外径3〜5 mm、長さ4〜7mm、内径1〜
2+nmである。In addition, since the reliefs 81a and 82a are formed in an arc shape in the axial cross section, the small diameter part d and the large diameter part d from the inner peripheral surface.
, since the portions X leading to the reliefs 81a and 82a are obtuse angles, there is no possibility that the shaft will be damaged by hitting the X portion due to deflection of the shaft, and it is possible to move from the small diameter portion d to the large diameter portion d. The oil film does not break in the X portion of the inner circumferential surface, preventing seizure etc. over a long period of time, resulting in stable quality and extended service life. Furthermore, when inserting the shaft into the bearing, the arcuate surface smoothly guides the tip of the shaft, which is preferable in that it does not damage the inner circumferential surface of the bearing or the shaft. In addition, the size of each oil-impregnated bearing 71.72 is as follows.
For example, outer diameter 3~5 mm, length 4~7 mm, inner diameter 1~
2+nm.
ところで、この逃げ81a、82aについては、焼結後
に選択エツチングあるいは放電加工などによって形成す
ることもできるが、粉末冶金法の特徴を利用した次のよ
うな製造方法を利用することが最適である。Incidentally, the reliefs 81a and 82a can be formed by selective etching or electric discharge machining after sintering, but it is best to use the following manufacturing method that takes advantage of the characteristics of powder metallurgy.
焼結部品は、通常、圧粉工程、焼結工程および焼結後の
再加圧工程を経て製造されるが、ここでは焼結工程後に
おける焼結体9として、第4図に示すように軸心方向中
央部(逃げ81a、82aを設ける個所に対応)の外周
面にリング状の溝10a。Sintered parts are usually manufactured through a powder compaction process, a sintering process, and a repressing process after sintering, but here, as shown in FIG. A ring-shaped groove 10a is provided on the outer circumferential surface of the central portion in the axial direction (corresponding to the location where the reliefs 81a and 82a are provided).
10b、locを有するものを形成しておく。これらの
溝10a、I Ob、10cについては、切削加工によ
って形成することらできるし、圧粉時に用いるダイの形
状を変えることによっても形成することができる。なお
、これらの溝10a、10b、10Cの大きさ、形状な
どについては、軸受孔8!。10b, one having loc is formed in advance. These grooves 10a, IOb, and 10c can be formed by cutting or by changing the shape of the die used during powder compaction. Note that the sizes, shapes, etc. of these grooves 10a, 10b, and 10C are as per the bearing hole 8! .
82の逃げ81a、82aの大きさなどによって適宜選
択できる。It can be selected as appropriate depending on the size of the reliefs 81a, 82a of 82, etc.
そして、このような焼結体9を通常の再加圧、すなわち
第5図に示すように、ダイ11.上バンチ12、下パン
チ13およびコアーロッド!4を用いることによって両
端から軸心方向に加圧圧縮する。すると、焼結体9の外
径部分およびう溝IOa、IOb、IOc部分はダイ1
1の形状にならうようにして外側に肉が移動する。一方
、軸受孔部分は溝10a、l Ob、I Ocの個所で
外にふくれることとなり、軸心方向の断面形状が一様な
コアーロッドI4に当たる個所と当たらない個所とがで
き、前述した第2図に示すような軸受71.72の形状
が得られる。Then, such a sintered body 9 is re-pressed in the usual manner, that is, as shown in FIG. Upper bunch 12, lower punch 13 and core rod! 4, it is compressed from both ends in the axial direction. Then, the outer diameter portion of the sintered body 9 and the grooves IOa, IOb, IOc portions are connected to the die 1.
The meat moves outward following the shape of 1. On the other hand, the bearing hole portion swells outward at the grooves 10a, 1Ob, and 1Oc, creating areas where it hits the core rod I4, which has a uniform cross-sectional shape in the axial direction, and areas where it does not. The shapes of the bearings 71 and 72 as shown in FIG.
このようにして製造されるこの発明の軸受71゜72に
あっては、軸受孔81.82に逃げ81a。In the bearings 71 and 72 of the present invention manufactured in this manner, there are reliefs 81a in the bearing holes 81 and 82.
82aが形成され、しかも逃げ81a、82aのない両
端部分81b、82c;82b、82cが同時に圧縮さ
れているため、偏心および寸法のバラツキもかなり少な
くなる。82a is formed, and both end portions 81b, 82c; 82b, 82c without reliefs 81a, 82a are simultaneously compressed, so that eccentricity and dimensional variations are considerably reduced.
次に、コアレスモータへの適用例について実際に行なっ
たテスト例を挙げることによって、この発明の効果をよ
り明らかにする。Next, the effects of the present invention will be made clearer by giving an example of a test actually conducted on an example of application to a coreless motor.
外径が4φ、軸受孔の内径が1.2φ、長さが611I
Inで、軸受孔中央の逃げ部の径が2.5φのこの発明
の焼結含油軸受について、回転数510Orpmの条件
でテストをおこなったところ、次表のような結果を得た
。The outer diameter is 4φ, the inner diameter of the bearing hole is 1.2φ, and the length is 611I.
The sintered oil-impregnated bearing of the present invention made of In and having a diameter of 2.5φ in the relief part at the center of the bearing hole was tested at a rotational speed of 510 rpm, and the results shown in the following table were obtained.
(注) これらの電流値(X)は偏心やカジリが大きい
ほど大きい値になるものである。(Note) These current values (X) become larger as eccentricity and galling become larger.
この発明は、軸受全体を焼結材で構成し、軸受内径を小
径部と円弧状の大径部とから構成したために、小径部か
ら大径部に至る部分が鈍角となり、そのためにノヤフト
にたわみかあってらソヤフトかじりなどを起こさないだ
けでなく、油膜切れら起こさないので、長寿命化を図る
ことができる。In this invention, the entire bearing is made of sintered material, and the inner diameter of the bearing is made up of a small diameter part and an arc-shaped large diameter part, so the part from the small diameter part to the large diameter part forms an obtuse angle, and as a result, the bearing is bent in a straight line. Not only does it not cause galling of the soyaft, but it also prevents oil film from breaking, resulting in a longer service life.
加えて、小径部と大径部との直径差を2μm以上とした
ので、十分な油溜りを確保することができ、潤滑油を小
径部内周面に長期間にわたって安定して供給することが
でき、この点でも製品の長寿命化を図ることができる。In addition, since the diameter difference between the small diameter part and the large diameter part is set to 2 μm or more, a sufficient oil reservoir can be secured, and lubricating oil can be stably supplied to the inner peripheral surface of the small diameter part over a long period of time. In this respect as well, the life of the product can be extended.
第1図は従来のこの種軸受の適用例を示す図、第2図(
a)および(b)はそれぞれこの発明による焼結含油軸
受の実施例を示す断面図、第3図はこの発明の軸受の適
用例を示す図、第4図(a)〜(c)はこの発明の製造
方法で用いる焼結体の各側を示す断面図、第5図はこの
発明での再加圧工程における加圧圧縮状態を示す要部断
面図である。
71.72・・・・・・この発明による焼結含油軸受、
81.82・・・・・・軸受孔、81a、82a・・・
・・・逃げ(軸心方向中央部)、8 lb、81c;8
2b、82c・・・・・・軸受の両端部分、9・・・・
・・焼結体、10a、lOb、10C・・・・・・リン
グ状の溝、11・・・・・・グイ、14・・・・・・コ
アーロッド。Figure 1 shows an application example of a conventional bearing of this type, and Figure 2 (
a) and (b) are cross-sectional views showing examples of the sintered oil-impregnated bearing according to the present invention, FIG. 3 is a view showing an application example of the bearing of the present invention, and FIGS. FIG. 5 is a sectional view showing each side of the sintered body used in the manufacturing method of the invention, and FIG. 5 is a sectional view of the main part showing the pressurized and compressed state in the repressing step in the invention. 71.72... Sintered oil-impregnated bearing according to this invention,
81.82...Bearing hole, 81a, 82a...
...Escape (center in axial direction), 8 lb, 81c; 8
2b, 82c... Both ends of the bearing, 9...
...Sintered body, 10a, lOb, 10C...Ring-shaped groove, 11...Gui, 14...Core rod.
Claims (1)
小さく中央部で大きくなるように軸方向断面が円弧状に
形成され、小径部と大径部との直径差が2μm以上に設
定されていることを特徴とする焼結含油軸受。The entire bearing is made of sintered material, and the axial cross section is formed in an arc shape so that the inner diameter of the bearing is smaller at both ends in the axial direction and larger at the center, and the difference in diameter between the small diameter part and the large diameter part is set to 2 μm or more. A sintered oil-impregnated bearing characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31950887A JPS63270918A (en) | 1987-12-17 | 1987-12-17 | Oil impregnated sintered bearing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31950887A JPS63270918A (en) | 1987-12-17 | 1987-12-17 | Oil impregnated sintered bearing |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18744580A Division JPS57110823A (en) | 1980-12-27 | 1980-12-27 | Sintered oil containing bearing and its manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63270918A true JPS63270918A (en) | 1988-11-08 |
JPH0445692B2 JPH0445692B2 (en) | 1992-07-27 |
Family
ID=18111005
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31950887A Granted JPS63270918A (en) | 1987-12-17 | 1987-12-17 | Oil impregnated sintered bearing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63270918A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5519933A (en) * | 1993-02-18 | 1996-05-28 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Process for manufacture of bearing unit |
US7059052B2 (en) | 1997-03-06 | 2006-06-13 | Ntn Corporation | Hydrodynamic type porous oil-impregnated bearing |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS478842U (en) * | 1971-02-26 | 1972-10-03 | ||
JPS4867140U (en) * | 1971-12-07 | 1973-08-25 |
-
1987
- 1987-12-17 JP JP31950887A patent/JPS63270918A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS478842U (en) * | 1971-02-26 | 1972-10-03 | ||
JPS4867140U (en) * | 1971-12-07 | 1973-08-25 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5519933A (en) * | 1993-02-18 | 1996-05-28 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Process for manufacture of bearing unit |
US7059052B2 (en) | 1997-03-06 | 2006-06-13 | Ntn Corporation | Hydrodynamic type porous oil-impregnated bearing |
Also Published As
Publication number | Publication date |
---|---|
JPH0445692B2 (en) | 1992-07-27 |
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